(19)
(11) EP 0 851 606 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.01.1999 Bulletin 1999/01

(43) Date of publication A2:
01.07.1998 Bulletin 1998/27

(21) Application number: 97310010.0

(22) Date of filing: 11.12.1997
(51) International Patent Classification (IPC)6: H04B 7/155
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.12.1996 US 774546

(71) Applicant: LUCENT TECHNOLOGIES INC.
Murray Hill, New Jersey 07974-0636 (US)

(72) Inventors:
  • Bi, Qi
    Morris Plains, New Jersey 07950 (US)
  • Myer, Robert Evan
    Denville, New Jersey 07834 (US)

(74) Representative: Buckley, Christopher Simon Thirsk 
Lucent Technologies (UK) Ltd, 5 Mornington Road
Woodford Green, Essex IG8 0TU
Woodford Green, Essex IG8 0TU (GB)

   


(54) Range repeater for a transmission system


(57) The invention is a repeater for a telecommunications transmission system such as a CDMA wireless system. The repeater reduces leakage by means of a feedback signal (on 30,31,32,33) whose amplitude and phase are adjusted (in 31) in response to the amplitude and phase of a sampled input signal (from 35) when a switch (24) turns off the normal output of the repeater for a short period of time. In one embodiment, a pilot signal (from 40) is transmitted during this time period so that the sampled input is the leakage signal. In another embodiment, the sampled input is the normal transmission signal received during the time period.






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